To zoom on a comic, it depends on the platform. On a website, look for the plus or magnifying glass icon. On a mobile app, try double-tapping or using the pinch-to-zoom gesture. Some comics might have fixed zoom levels though.
You can usually zoom in on a comic by using the pinch gesture on a touchscreen device or by clicking the zoom buttons provided in the comic viewer.
Zooming on a comic can be done in different ways. If it's a digital comic on your computer, you might use the scroll wheel of your mouse while holding a certain key. On a tablet or phone, the common methods are pinch and spread gestures. Also, check if the comic viewer has specific zoom settings you can adjust.